Insulator



Patented Aug. 20, 1192-9.

CHRISTIAN AALBORG, OF PITTSBURGH,

HOUSE ELECTRIC & MANUFACTURING VANIA.

PENNSYLVANIA, ASSIGNOR TO WESTING- COMPANY, A CORPORATION OF PENNSYL- INsULATo'n.

Application nica July 15,

My invention relates `to 'insulating devices and particularly to insulator structures for supporting bus bars, switches and conductors.

One object of my inventionis to provide an insulator that shall be light inweight,

\ simple and durable in construction and effective in operation.

. Another object of my invention is to provide an insulator, of a type usually comprising relatively cumbersome porcelain and cast metal parts, that shall be constructed of fibrous insulating material impregnated with a binder, and relatively-simple pressedmetal members. s

Another object of my invention is to provide an insulator, and co-operating metal supporting members therefor, that shall be so formed and related as to resist forces tending to separate them and that shall permit of readyassembly and disassembly.

A' further object of my invention is to provide a non-refractory insulating structure that shall be providedwith protective means to increase the life thereof and to permit its effective use for outdoor service.

In certain insulating structures of the pin or pillar type adapted to supportbus bars, transmission, or other line conductors and between two of Whicha fuse or switch arm may be adapted to extend, it has heretofore been usual to employ porcelain insulating members supported at their ends by cast metal members. Certain of these structures have been very effective in operation but their excessive Weight has required that they be very strongly supported and this together with the frequent vbreakage has been the cause of inconvenience and expense in handling andshipping.

Fiber and other composition insulating material have not, to the best of my knowledge, been extensively employed nor considered practicable in weather-exposed4 service by reason of deterioration. This is particularly true where the insulators are eX- posed to sea air.

In practicing my invention, I provide an /insulatorstructure in which both the insulating aiid metal parts are constructed of relatively-thin sheet material, thereby very eatly reducing the Weight of the insulator. lhe insulating and conducting parts have 1920. `Serial No. 896,452.

the forms of frustrums of cones and so engage each other in telescoping clamping relation as to facilitate the assembly and disassembly of the insulator and prevent the separation of the parts.

The insulating parts are so coated with a protective enamel as to permit their use under all kinds of outdoor conditions.

In a copending application, Serial No. 394,519, filed July 7, 1920, by Frank Conrad and lassigned to the Westinghouse Electric & Manufacturing Company, are disclosed the general principles of certain stress distributing members employed in the devices of my herein illustrated and described invention.

Figure l, of the accompanying drawings,

is a side view, partially in elevation and- Fig. 3 is a detail View of a sheet of mateV rial employed in the construction of an insulator embodying my invention, and

Figs. 4 yand 5 are detail diagrammatic views of a mandrel and pressing members particularly adapted for the manufacture of my novel insulator.

In Fig. l, a high-potential switch l comprises, in general, a base member 2, insulating pillar members 3 and 4, a pivoted blade member 5, a terminal member 6 disposed onl the pillar 3 and on which ber 5 is pivoted, by a bolt or pin 7, and a jaw member 8 disposed on the pillar 4.

The pillar members 3 and 4 have the forms of hollow f rustums of cones preferably having relatively-thin walls constructed of paper impregnated with a binder, such as a lphenolic condensation product, and cut the blade meminto sheets9 of substantially segmental form ly baked to harden the binder. Thus constructed, the pillar members 3 and 4will be unaffected by wide temperature changes, moisture, weak acids and alkalis.

The base member 2 is constructed of relatively-thin sheet metal, cut and pressed to shape, having a transversely-projecting perimetral iange 12 and flanges 13 disposed on oneV side thereof and so formed as to constitute frustums of cones. surround openings in the base member through which the pillar members 3 and 4 may be' inserted, small end first, and are proportioned to snugly embrace the lower ends of the pillar members. Members 14 conform to, and snugly t, the inner surfaces of the pillar members at the bases of the latter and are provided with apertured transverselyprojecting iianges or lugs 15 that may be secured to the base member 2 by means of screws 16.

Similarly, at the louter ends of the pillar members 3 and 4, pressed metal members 17 and 18 of substantially cup-shape conform to, and snugly fit, the outer and inner surfaces, respectively, of the members 3 and 4. Screws 19, or other suitable means, may be employed to secure the terminal members 6 and 8 to their respectively-adjacent sets of the members 17 and 18 and to hold the latter in clamping relation to the pillar members.

The members 14 are provided with integral dome portions 20 extending into the inl sulating members 3 and 4, beyond the anges 13 and the members 18 are provided with separable domev members 21, secured thereto l not be displaced outwardly from the flanges 13 nor the members 18 displaced outwardly from the 'members 3 and 4, because any forces, other than forces greater than the tensile strengths of the materials tending to displace the parts, serve only to more securely bind the co-operating parts togethers Obviously, by employing slightly modied parts at the outer endsof the members 3 and 4, or by employing one only of the pillar members, the device may readily be adapted as a support for bus-bars, transmission-lineor other conductors. In Fig. 2, a similar structure adapted as a strain insulator is shown. At the smaller end of an insulating member 3, members 17 and 18 are secured in positibn by a bolt 23 to which an eye member 24 is attached. At the larger end of the member 3, a member 13a, co-operates' with a member 14 to clamp the insulating member 3. A disk 25, sup- The iianges 13 enamel, is applied to the members 3 to protect them against adverse iniiuences such as flashovers and the effects of Weather.

While I have shown and described particular forms of my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. In an insulator, the combination with an `insulating member embodying a tubular terminal portion having substantially frustoconical inner and outer surfaces, of a terminal device comprising clamping members that by longitudinal relative movement laterally clamp said inner and outer surfaces and means for connecting said clamping members and longitudinally moving the same to thus clamp said terminal portion.

2. ,In an insulator, the combination with an insulating member embodying a hollow terminal portion having inner and uter longitudinal surfaces sloping relative to the longitudinal axis of the terminal portion, of a terminal device comprising clamping portions that, by longitudinal relative movement, laterally vclamp said sloping-surface terminal portion between them and means for connecting said clamping portions and longitudinally relatively moving the same to thus clamp said terminal portion.

3. In an insulator, the combination with an insulating structure embodying a substantially tubular-terminal portion having laterally-opposite inner and outer longitudinal side lsurfaces one of which slopes longitudinally, of a terminal device comprising clamping members that, by longitudinal relative movement, laterally clamp said opposite-surface terminal portion between them, 'and means cooperating between said clamping members for longitudinally relatively moving the same to thus clamp said terminal portion.

4. In an insulator, the combination with an insulating member having substantially frustro-conical inner and outer surfaces, of a. terminal device comprising longitudinally relatively movable clamping members having substantially frustro-conical tubular portions substantiallyconforming to said surfaces inside and outside said insulating member, and means for connecting said clamping porting an eye member 26, engages the outer members and longitudinally relatively moving the same to clamp the tubular portionsA thereof against the insulating member.

5. In an insulator, the combination with an insulating lmember embodying a tubular terminal portion having substantially frustoconical inner ,and outer surfaces, of a terminal device comprising longitudinally relativelymovable clampi-ng members having substantially frusto-conical tubular clamping portions conforming to, and cooperating with, said inner and outer surfaces and laterally-extending portions, and means cooperating between said laterally-extending portions for longitudinally relatively moving said clamping members to clamp said tubular terminal portion of the insulating member between said clamping portions.

6. In an insulator, the combination withY a tubular `insulating member having portions including substantiall frusto-conical inner and outer surfaces, o a terminal device for each end thereof comprising clamping members that, by longitudinal relative movement, laterally clamp said portions between them and means for connecting said clamping members and longitudinally m0v ing the same to thus clamp the insulating member.

7. In aninsulator, thecombination with an insulating structure having laterallyopposite longitudinal surfaces, one of which slopes longitudinally, of a terminal device comprising clamping members that, by longitudinal relativemovement, laterally clamp said surfaces between them, and means cooperating between said clamping members for connecting and longitudinally relatively moving the same to thus clamp said insulating structure. e

In testimony whereof, I have hereunto subscribed my name this 9th day of Jul 1920.

CHRISTIAN AALB RG. 

